#!/bin/bash

# Function to list files in a directory
list_contents() {
    local dir="$1"
    local result=()

    # Check if the directory contains files or subdirectories
    local has_file=false
    local has_folder=false

    # Loop through the directory contents
    for item in "$dir"/*; do
        if [ -f "$item" ]; then
            # If it's a file, get its extension and add it to the result
            ext="${item##*.}"
            result+=("$ext")
            has_file=true
        elif [ -d "$item" ]; then
            has_folder=true
        fi
    done

    # If files are found, return their extensions
    if [ "$has_file" = true ]; then
        echo "$(printf "%s, " "${result[@]}" | sed 's/, $//')"
    elif [ "$has_folder" = true ]; then
        echo "folder"
    fi
}

# Function to recursively list non-empty directories
list_non_empty_directories() {
    local base_dir="$1"

    # Loop through the directories in the base directory
    for dir in "$base_dir"/*; do
        if [ -d "$dir" ]; then
            # List contents of the directory
            contents=$(list_contents "$dir")
            if [ -n "$contents" ]; then
                echo "$(basename "$dir") ($contents)"
            fi
            # Recursively check subdirectories
            list_non_empty_directories "$dir"
        fi
    done
}

# Start listing from the current directory
list_non_empty_directories "."